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Question

Match the atomic numbers 4, 14, 8, 15, and 19 with a metal of valency 1.

A
4
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B
14
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C
15
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D
19
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Solution

The correct option is D 19
Atomic no 19 is potassium with configuration of 2,8,8,1 so it have valency of 1. Also potassium is metal.

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